要求：点击el-date-picker选择时间范围时，默认展开当月和上个月。
但是Element UI的组件默认展开的是本月和下一个月，如下图所示：
改为
<span @click="changeInitCalendarRange"><el-date-picker v-model="ruleForm.time" type="datetimerange" value-format="yyyy-MM-dd HH:mm:ss"range-separator="至" start-placeholder="开始日期" end-placeholder="结束日期" :picker-options="pickerOptions" @change="onsetmonitor" @blur="blur"class="form-width"></el-date-picker>
</span><script>
export default {data() {return {pickerOptions: {disabledDate(time) {return time.getTime() > Date.now() - 8.64e7 || time.getTime() < Date.now() - 8.64e7 * 90;},shortcuts: [{text: '最近一周',onClick(picker) {const end = new Date();const start = new Date();start.setTime(start.getTime() - 3600 * 1000 * 24 * 7);picker.$emit('pick', [start, end]);},},{text: '最近一个月',onClick(picker) {const end = new Date();const start = new Date();start.setTime(start.getTime() - 3600 * 1000 * 24 * 30);picker.$emit('pick', [start, end]);},},{text: '最近三个月',onClick(picker) {const end = new Date();const start = new Date();start.setTime(start.getTime() - 3600 * 1000 * 24 * 90);picker.$emit('pick', [start, end]);},},],},};},methods: {/**时间范围选择器，组件默认展示上月和本月 点击判断**/changeInitCalendarRange() {if(this.countss > 0){return}else{this.countss++let element = document.querySelector("button.el-picker-panel__icon-btn.el-icon-arrow-left");if (element){element.click()};};},//多次点击清空按钮blur(){if(this.ruleForm.time == null){this.countss = 0;}},//如果选定值，重置countssonsetmonitor(){if(this.ruleForm.time){return};this.countss = 0},}
}
